Through this series we see how to extract information from the Elastic MapReduce ruby client, and use it to create the same command using the AWS CLI tool. In this article, we will look specifically at running a Streaming cluster.

Elastic MapReduce ruby client

Credentials

~/.aws/credentials.json

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{
"access_id": "C99F5C7EE00F1EXAMPLE",
"private_key": "a63xWEj9ZFbigxqA7wI3Nuwj3mte3RDBdEXAMPLE",
"keypair": "my-key",
"key-pair-file": "~/.ssh/my-key.pem",
"log_uri": "s3n://my-bucket/hadoop/",
"region": "us-east-1"
}

Create the job flow

Console - user@hostname ~ $

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elastic-mapreduce -v \
--create \
--name "Test Streaming" \
--instance-group MASTER \
--bid-price 0.06 \
--instance-count 1 \
--instance-type m1.small \
--instance-group CORE \
--bid-price 0.06 \
--instance-count 2 \
--instance-type m1.small \
--stream \
--input s3n://elasticmapreduce/samples/wordcount/input \
--mapper s3://elasticmapreduce/samples/wordcount/wordSplitter.py \
--reducer aggregate \
--output s3n://my-bucket/streaming \
-c ~/.aws/credentials.json

Output

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Requesting URL:
https://us-east-1.elasticmapreduce.amazonaws.com/
Query string:
Steps.member.1.HadoopJarStep.Args.member.7=-reducer&Instances.KeepJobFlowAliveWhenNoSteps=false&LogUri=s3n%3A%2F%2Fmy-bucket%2Fhadoop%2F&Steps.member.1.HadoopJarStep.Args.member.5=-mapper&Steps.member.1.HadoopJarStep.Args.member.4=s3n%3A%2F%2Fmy-bucket%2Fstreaming&Instances.Ec2KeyName=my-key&Instances.InstanceGroups.member.1.InstanceRole=MASTER&Instances.InstanceGroups.member.2.InstanceType=m1.small&Name=Test%20Streaming&Steps.member.1.HadoopJarStep.Args.member.3=-output&Steps.member.1.HadoopJarStep.Jar=%2Fhome%2Fhadoop%2Fcontrib%2Fstreaming%2Fhadoop-streaming.jar&Instances.InstanceGroups.member.1.Market=SPOT&Timestamp=2013-05-16T00%3A38%3A34%2B00%3A00&Instances.InstanceGroups.member.1.BidPrice=0.06&Instances.InstanceGroups.member.2.Market=SPOT&VisibleToAllUsers=false&SignatureVersion=2&AWSAccessKeyId=C99F5C7EE00F1EXAMPLE&Steps.member.1.HadoopJarStep.Args.member.8=aggregate&Instances.InstanceGroups.member.2.InstanceRole=CORE&Instances.TerminationProtected=false&Instances.InstanceGroups.member.1.InstanceCount=1&Steps.member.1.ActionOnFailure=CANCEL_AND_WAIT&Steps.member.1.Name=Example%20Streaming%20Step&Instances.InstanceGroups.member.1.InstanceType=m1.small&ContentType=JSON&Steps.member.1.HadoopJarStep.Args.member.2=s3n%3A%2F%2Felasticmapreduce%2Fsamples%2Fwordcount%2Finput&Signature=bxw4ztNqxh8%2F3fvhKq72FS%2BxIG8A3v9YNejf2tCwCkk%3D&Instances.InstanceGroups.member.2.InstanceCount=2&Action=RunJobFlow&Instances.InstanceGroups.member.2.BidPrice=0.06&Steps.member.1.HadoopJarStep.Args.member.1=-input&Instances.InstanceGroups.member.1.Name=Master%20Instance%20Group&Steps.member.1.HadoopJarStep.Args.member.6=s3%3A%2F%2Felasticmapreduce%2Fsamples%2Fwordcount%2FwordSplitter.py&AmiVersion=latest&SignatureMethod=HmacSHA256&Instances.InstanceGroups.member.2.Name=Core%20Instance%20Group
Headers:
x-amzn-RequestId8cbb460f-5a8c-48b4-ae10-6da34e0af803Hostus-east-1.elasticmapreduce.amazonaws.com:443User-Agentruby-client
Created job flow j-R48QY5DF8OS3M

Formatted Output

Output - Requesting URL

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https://us-east-1.elasticmapreduce.amazonaws.com/

Output - Parameters

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AWSAccessKeyId=C99F5C7EE00F1EXAMPLE
Action=RunJobFlow
AmiVersion=latest
ContentType=JSON
Instances.Ec2KeyName=my-key
Instances.InstanceGroups.member.1.BidPrice=0.06
Instances.InstanceGroups.member.1.InstanceCount=1
Instances.InstanceGroups.member.1.InstanceRole=MASTER
Instances.InstanceGroups.member.1.InstanceType=m1.small
Instances.InstanceGroups.member.1.Market=SPOT
Instances.InstanceGroups.member.1.Name=Master Instance Group
Instances.InstanceGroups.member.2.BidPrice=0.06
Instances.InstanceGroups.member.2.InstanceCount=2
Instances.InstanceGroups.member.2.InstanceRole=CORE
Instances.InstanceGroups.member.2.InstanceType=m1.small
Instances.InstanceGroups.member.2.Market=SPOT
Instances.InstanceGroups.member.2.Name=Core Instance Group
Instances.KeepJobFlowAliveWhenNoSteps=false
Instances.TerminationProtected=false
LogUri=s3n://my-bucket/hadoop/
Name=Test Streaming
Signature=bxw4ztNqxh8/3fvhKq72FS+xIG8A3v9YNejf2tCwCkk=
SignatureMethod=HmacSHA256
SignatureVersion=2
Steps.member.1.ActionOnFailure=CANCEL_AND_WAIT
Steps.member.1.HadoopJarStep.Args.member.1=-input
Steps.member.1.HadoopJarStep.Args.member.2=s3n://elasticmapreduce/samples/wordcount/input
Steps.member.1.HadoopJarStep.Args.member.3=-output
Steps.member.1.HadoopJarStep.Args.member.4=s3n://my-bucket/streaming
Steps.member.1.HadoopJarStep.Args.member.5=-mapper
Steps.member.1.HadoopJarStep.Args.member.6=s3://elasticmapreduce/samples/wordcount/wordSplitter.py
Steps.member.1.HadoopJarStep.Args.member.7=-reducer
Steps.member.1.HadoopJarStep.Args.member.8=aggregate
Steps.member.1.HadoopJarStep.Jar=/home/hadoop/contrib/streaming/hadoop-streaming.jar
Steps.member.1.Name=Example Streaming Step
Timestamp=2013-05-16T00:38:34+00:00
VisibleToAllUsers=false

Output - Headers

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Host: us-east-1.elasticmapreduce.amazonaws.com:443
User-Agent: ruby-client
x-amzn-RequestId: 8cbb460f-5a8c-48b4-ae10-6da34e0af803

Output - Non-verbose output

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Created job flow j-R48QY5DF8OS3M

API Request

Example API Request

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https://us-east-1.elasticmapreduce.amazonaws.com/
?Action=RunJobFlow
&Name=Test Streaming
&Instances.Ec2KeyName=my-key
&Instances.InstanceGroups.member.1.Name=Master Instance Group
&Instances.InstanceGroups.member.1.InstanceRole=MASTER
&Instances.InstanceGroups.member.1.InstanceType=m1.small
&Instances.InstanceGroups.member.1.InstanceCount=1
&Instances.InstanceGroups.member.1.Market=SPOT
&Instances.InstanceGroups.member.1.BidPrice=0.06
&Instances.InstanceGroups.member.2.Name=Core Instance Group
&Instances.InstanceGroups.member.2.InstanceRole=CORE
&Instances.InstanceGroups.member.2.InstanceType=m1.small
&Instances.InstanceGroups.member.2.InstanceCount=2
&Instances.InstanceGroups.member.2.Market=SPOT
&Instances.InstanceGroups.member.2.BidPrice=0.06
&Instances.KeepJobFlowAliveWhenNoSteps=false
&Instances.TerminationProtected=false
&Steps.member.1.Name=Example Streaming Step
&Steps.member.1.ActionOnFailure=CANCEL_AND_WAIT
&Steps.member.1.HadoopJarStep.Jar=/home/hadoop/contrib/streaming/hadoop-streaming.jar
&Steps.member.1.HadoopJarStep.Args.member.1=-input
&Steps.member.1.HadoopJarStep.Args.member.2=s3n://elasticmapreduce/samples/wordcount/input
&Steps.member.1.HadoopJarStep.Args.member.3=-output
&Steps.member.1.HadoopJarStep.Args.member.4=s3n://my-bucket/streaming
&Steps.member.1.HadoopJarStep.Args.member.5=-mapper
&Steps.member.1.HadoopJarStep.Args.member.6=s3://elasticmapreduce/samples/wordcount/wordSplitter.py
&Steps.member.1.HadoopJarStep.Args.member.7=-reducer
&Steps.member.1.HadoopJarStep.Args.member.8=aggregate
&LogUri=s3n://my-bucket/hadoop/
&AmiVersion=latest
&VisibleToAllUsers=false
&*AUTHPARAMS*

AWS CLI

Console - user@hostname ~ $

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aws --region us-east-1 emr \
run-job-flow \
--name "Test Streaming" \
--instances "{
    \"ec_2_key_name\": \"my-key\",
    \"instance_groups\": [
        {
            \"name\": \"Master Instance Group\",
            \"instance_role\": \"MASTER\",
            \"instance_type\": \"m1.small\",
            \"instance_count\": 1,
            \"market\": \"SPOT\",
            \"bid_price\": \"0.06\"
        },
        {
            \"name\": \"Core Instance Group\",
            \"instance_role\": \"CORE\",
            \"instance_type\": \"m1.small\",
            \"instance_count\": 2,
            \"market\": \"SPOT\",
            \"bid_price\": \"0.06\"
        }
    ],
    \"keep_job_flow_alive_when_no_steps\": false,
    \"termination_protected\": false
}" \
--steps "[
    {
        \"name\": \"Example Streaming Step\",
        \"action_on_failure\": \"CANCEL_AND_WAIT\",
        \"hadoop_jar_step\": {
            \"jar\": \"/home/hadoop/contrib/streaming/hadoop-streaming.jar\",
            \"args\": [
                \"-input\",
                \"s3n://elasticmapreduce/samples/wordcount/input\",
                \"-output\",
                \"s3n://my-bucket/streaming\",
                \"-mapper\",
                \"s3://elasticmapreduce/samples/wordcount/wordSplitter.py\",
                \"-reducer\",
                \"aggregate\"
            ]
        }
    }
]" \
--log-uri "s3n://my-bucket/hadoop/" \
--ami-version "latest"

Output

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{
    "ResponseMetadata": {
        "RequestId": "5a35d4dd-4e03-4fd0-a911-00b9dbb4c60d"
    }, 
    "JobFlowId": "j-2ED0BNL7QVENH"
}

Resources

Parts in this series

Comments